Product Warranty Provisions (Schedule Of Accrued Warranty) (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Product Warranty Provisions [Abstract]
Warranty accrual, beginning of the fiscal year	$ 653,473	$ 691,832
Warranty expense incurred	25,984	650,367
Payments made	(143,359)	(688,726)
Warranty accrual, end of the fiscal year	$ 536,098	$ 653,473